I bought a gorg at Carti, red body then purple pag lumabas yun polyps. May damaged din...nip/cut ko about 1/2" further down from the damaged tip. I read this procedure sa net, its to prevent further infection kaya add pa ng 1/2". Try to google "gorgonian care" and read/research from there. BTW, my is doing fine polyps are extending about 1-1/2 month na. Dont know if its NPS though, pero nasa lighted area of my tank.
Goodluck...